81606703 has 2 divisors, whose sum is σ = 81606704. Its totient is φ = 81606702.

The previous prime is 81606673. The next prime is 81606709. The reversal of 81606703 is 30760618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81606703 - 2⁵ = 81606671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81606709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40803351 + 40803352.

It is an arithmetic number, because the mean of its divisors is an integer number (40803352).

Almost surely, 2^81606703 is an apocalyptic number.

81606703 is a deficient number, since it is larger than the sum of its proper divisors (1).

81606703 is an equidigital number, since it uses as much as digits as its factorization.

81606703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 81606703 is about 9033.6428421761. The cubic root of 81606703 is about 433.7524532081.

The spelling of 81606703 in words is "eighty-one million, six hundred six thousand, seven hundred three".